102 lines
No EOL
2.5 KiB
PHP
102 lines
No EOL
2.5 KiB
PHP
<?php
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/**
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* In-memory cache storage engine.
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*
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* Store values in memory, for use in a single session scope.
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*
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* @instantiator new
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* @author Time.ly Network, Inc.
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* @since 2.0
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* @package Ai1EC
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* @subpackage Ai1EC.Cache
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*/
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final class Ai1ec_Cache_Memory implements Ai1ec_Cache_Interface {
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/**
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* @var array Map of memory entries.
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*/
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protected $_entries = array();
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/**
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* @var int Number of entries to hold in map.
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*/
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protected $_limit = 0;
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/**
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* Constructor initiates stack (memory) length.
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*
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* @param int $limit Number of entries specific to this location.
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*
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* @return void Constructor does not return.
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*/
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public function __construct( $limit = 50 ) {
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$limit = (int)$limit;
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if ( $limit < 10 ) {
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$limit = 10;
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}
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$this->_limit = $limit;
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}
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/**
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* Write data to memory under given key.
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*
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* @param string $key Key under which value must be written.
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* @param mixed $value Value to associate with given key.
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*
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* @return bool Success.
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*/
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public function set( $key, $value ) {
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if ( count( $this->_entries ) > $this->_limit ) {
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array_shift( $this->_entries ); // discard
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}
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$this->_entries[$key] = $value;
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return true;
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}
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/**
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* Add data to memory under given key, if it does not exist.
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*
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* @param string $key Key under which value must be added.
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* @param mixed $value Value to associate with given key.
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*
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* @return bool Success.
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*/
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public function add( $key, $value ) {
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if ( isset( $this->_entries[$key] ) ) {
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return false;
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}
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return $this->set( $key, $value );
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}
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/**
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* Retrieve data from memory, stored under specified key.
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*
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* @param string $key Key under which value is expected to be.
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* @param mixed $default Value to return if nothing is found.
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*
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* @return mixed Found value or {$default}.
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*/
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public function get( $key, $default = NULL ) {
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if ( ! isset( $this->_entries[$key] ) ) {
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return $default;
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}
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return $this->_entries[$key];
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}
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/**
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* Remove entry from cache table.
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*
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* @param string $key Key to be removed.
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*
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* @return bool Success.
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*/
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public function delete( $key ) {
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if ( ! isset( $this->_entries[$key] ) ) {
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return false;
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}
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unset( $this->_entries[$key] );
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return true;
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}
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} |